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Make usage of the Netty DNS resolver configurable

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This adds a new configuration value "use_netty_dns_resolver", which
defaults to true.  This allows users to opt out of Netty's DNS
resolver if they encounter any issues with it.
This commit is contained in:
Nate Mortensen 2017-07-26 11:52:48 -06:00 committed by Jamie Mansfield
parent 6b33c62e14
commit c7cd61c968
2 changed files with 174 additions and 111 deletions
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174
BungeeCord-Patches/0040-Optionally-use-async-Netty-DNS-resolver.patch Normal file
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@ -0,0 +1,174 @@
From 76a25a666157c1d1fa94ddf7a46e7232aee60e56 Mon Sep 17 00:00:00 2001
From: Tux <write@imaginarycode.com>
Date: Wed, 21 Dec 2016 03:13:03 -0500
Subject: [PATCH] Optionally use async Netty DNS resolver
We no longer need to cache the address for the session server now.
diff --git a/api/src/main/java/net/md_5/bungee/api/ProxyConfig.java b/api/src/main/java/net/md_5/bungee/api/ProxyConfig.java
index a443614..43519ce 100644
--- a/api/src/main/java/net/md_5/bungee/api/ProxyConfig.java
+++ b/api/src/main/java/net/md_5/bungee/api/ProxyConfig.java
@@ -173,6 +173,11 @@ public interface ProxyConfig
*/
String getGameVersion();
+ /**
+ * Whether Netty's async DNS resolver is used for account authentication.
+ */
+ boolean isUseNettyDnsResolver();
+
// Throttling options
/**
diff --git a/proxy/pom.xml b/proxy/pom.xml
index 98656fe..ae6ee15 100644
--- a/proxy/pom.xml
+++ b/proxy/pom.xml
@@ -41,6 +41,14 @@
<version>${netty.version}</version>
<scope>compile</scope>
</dependency>
+ <!-- Waterfall Start - add Netty DNS resolver -->
+ <dependency>
+ <groupId>io.netty</groupId>
+ <artifactId>netty-resolver-dns</artifactId>
+ <version>${netty.version}</version>
+ <scope>compile</scope>
+ </dependency>
+ <!-- Waterfall End -->
<dependency>
<groupId>io.netty</groupId>
<artifactId>netty-handler</artifactId>
diff --git a/proxy/src/main/java/io/github/waterfallmc/waterfall/conf/WaterfallConfiguration.java b/proxy/src/main/java/io/github/waterfallmc/waterfall/conf/WaterfallConfiguration.java
index 5983581..7dc3c2d 100644
--- a/proxy/src/main/java/io/github/waterfallmc/waterfall/conf/WaterfallConfiguration.java
+++ b/proxy/src/main/java/io/github/waterfallmc/waterfall/conf/WaterfallConfiguration.java
@@ -33,6 +33,13 @@ public class WaterfallConfiguration extends Configuration {
@Getter
private String gameVersion;
+ /**
+ * Whether we use Netty's async DNS resolver for the HttpClient.
+ * <p>Default is true (use Netty's async DNS resolver)</p>
+ */
+ @Getter
+ private boolean useNettyDnsResolver = true;
+
/*
* Throttling options
* Helps prevent players from overloading the servers behind us
@@ -56,6 +63,7 @@ public class WaterfallConfiguration extends Configuration {
// Throttling options
tabThrottle = config.getInt("throttling.tab_complete", tabThrottle);
gameVersion = config.getString("game_version", "").isEmpty() ? Joiner.on(", ").join(ProtocolConstants.SUPPORTED_VERSIONS) : config.getString("game_version", "");
+ useNettyDnsResolver = config.getBoolean("use_netty_dns_resolver", useNettyDnsResolver);
}
@Override
diff --git a/proxy/src/main/java/net/md_5/bungee/http/HttpClient.java b/proxy/src/main/java/net/md_5/bungee/http/HttpClient.java
index 2feb4d6..b265bb4 100644
--- a/proxy/src/main/java/net/md_5/bungee/http/HttpClient.java
+++ b/proxy/src/main/java/net/md_5/bungee/http/HttpClient.java
@@ -28,6 +28,10 @@ public class HttpClient
public static final int TIMEOUT = 5000;
private static final Cache<String, InetAddress> addressCache = CacheBuilder.newBuilder().expireAfterWrite( 1, TimeUnit.MINUTES ).build();
+ // Waterfall Start - optionally use async resolver from Netty
+ private static final io.netty.resolver.dns.DnsAddressResolverGroup dnsResolverGroup =
+ new io.netty.resolver.dns.DnsAddressResolverGroup(PipelineUtils.getDatagramChannel(), io.netty.resolver.dns.DefaultDnsServerAddressStreamProvider.INSTANCE);
+ // Waterfall End
@SuppressWarnings("UnusedAssignment")
public static void get(String url, EventLoop eventLoop, final Callback<String> callback)
@@ -57,19 +61,21 @@ public class HttpClient
}
}
- InetAddress inetHost = addressCache.getIfPresent( uri.getHost() );
- if ( inetHost == null )
- {
- try
- {
- inetHost = InetAddress.getByName( uri.getHost() );
- } catch ( UnknownHostException ex )
- {
- callback.done( null, ex );
- return;
- }
- addressCache.put( uri.getHost(), inetHost );
- }
+ // Waterfall Start - Move address creation to implementation method
+ //InetAddress inetHost = addressCache.getIfPresent( uri.getHost() );
+ //if ( inetHost == null )
+ //{
+ // try
+ // {
+ // inetHost = InetAddress.getByName( uri.getHost() );
+ // } catch ( UnknownHostException ex )
+ // {
+ // callback.done( null, ex );
+ // return;
+ // }
+ // addressCache.put( uri.getHost(), inetHost );
+ //}
+ // Waterfall End
ChannelFutureListener future = new ChannelFutureListener()
{
@@ -92,7 +98,39 @@ public class HttpClient
}
};
+ // Waterfall Start - Optionally use Netty's async DNS Resolver
+ if (net.md_5.bungee.api.ProxyServer.getInstance().getConfig().isUseNettyDnsResolver()) {
+ getWithNettyResolver(eventLoop, uri, port, future, callback, ssl);
+ } else {
+ getWithDefaultResolver(eventLoop, uri, port, future, callback, ssl);
+ }
+ //new Bootstrap().channel( PipelineUtils.getChannel() ).group( eventLoop ).handler( new HttpInitializer( callback, ssl, uri.getHost(), port ) ).
+ // option( ChannelOption.CONNECT_TIMEOUT_MILLIS, TIMEOUT ).remoteAddress( inetHost, port ).connect().addListener( future );
+ }
+
+ private static void getWithNettyResolver(EventLoop eventLoop, URI uri, int port, ChannelFutureListener future, Callback<String> callback, boolean ssl) {
+ java.net.InetSocketAddress address = java.net.InetSocketAddress.createUnresolved(uri.getHost(), port);
+ new Bootstrap().channel( PipelineUtils.getChannel() ).group( eventLoop ).handler( new HttpInitializer( callback, ssl, uri.getHost(), port ) ).
+ option( ChannelOption.CONNECT_TIMEOUT_MILLIS, TIMEOUT ).resolver(dnsResolverGroup).remoteAddress( address ).connect().addListener( future );
+ }
+
+ private static void getWithDefaultResolver(EventLoop eventLoop, URI uri, int port, ChannelFutureListener future, Callback<String> callback, boolean ssl) {
+ // This is identical to the Bungee implementation of #get other than the absence of the ChannelFutureListener creation
+ InetAddress inetHost = addressCache.getIfPresent( uri.getHost() );
+ if ( inetHost == null )
+ {
+ try
+ {
+ inetHost = InetAddress.getByName( uri.getHost() );
+ } catch ( UnknownHostException ex )
+ {
+ callback.done( null, ex );
+ return;
+ }
+ addressCache.put( uri.getHost(), inetHost );
+ }
new Bootstrap().channel( PipelineUtils.getChannel() ).group( eventLoop ).handler( new HttpInitializer( callback, ssl, uri.getHost(), port ) ).
option( ChannelOption.CONNECT_TIMEOUT_MILLIS, TIMEOUT ).remoteAddress( inetHost, port ).connect().addListener( future );
}
+ // Waterfall End
}
diff --git a/proxy/src/main/java/net/md_5/bungee/netty/PipelineUtils.java b/proxy/src/main/java/net/md_5/bungee/netty/PipelineUtils.java
index 503adfd..ad47dbb 100644
--- a/proxy/src/main/java/net/md_5/bungee/netty/PipelineUtils.java
+++ b/proxy/src/main/java/net/md_5/bungee/netty/PipelineUtils.java
@@ -111,7 +111,7 @@ public class PipelineUtils
return epoll ? EpollSocketChannel.class : NioSocketChannel.class;
}
- public static Class<? extends Channel> getDatagramChannel()
+ public static Class<? extends io.netty.channel.socket.DatagramChannel> getDatagramChannel() // Waterfall - change to DatagramChannel
{
return epoll ? EpollDatagramChannel.class : NioDatagramChannel.class;
}
--
2.7.1.windows.2

111
BungeeCord-Patches/0040-Use-async-Netty-DNS-resolver.patch
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@ -1,111 +0,0 @@
From c0d6188b4987814068db056085aa50db72efc1e3 Mon Sep 17 00:00:00 2001
From: Tux <write@imaginarycode.com>
Date: Wed, 21 Dec 2016 03:13:03 -0500
Subject: [PATCH] Use async Netty DNS resolver
We no longer need to cache the address for the session server now.
diff --git a/proxy/pom.xml b/proxy/pom.xml
index 98656fe..ae6ee15 100644
--- a/proxy/pom.xml
+++ b/proxy/pom.xml
@@ -41,6 +41,14 @@
<version>${netty.version}</version>
<scope>compile</scope>
</dependency>
+ <!-- Waterfall Start - add Netty DNS resolver -->
+ <dependency>
+ <groupId>io.netty</groupId>
+ <artifactId>netty-resolver-dns</artifactId>
+ <version>${netty.version}</version>
+ <scope>compile</scope>
+ </dependency>
+ <!-- Waterfall End -->
<dependency>
<groupId>io.netty</groupId>
<artifactId>netty-handler</artifactId>
diff --git a/proxy/src/main/java/net/md_5/bungee/http/HttpClient.java b/proxy/src/main/java/net/md_5/bungee/http/HttpClient.java
index 2feb4d6..3db3639 100644
--- a/proxy/src/main/java/net/md_5/bungee/http/HttpClient.java
+++ b/proxy/src/main/java/net/md_5/bungee/http/HttpClient.java
@@ -27,7 +27,11 @@ public class HttpClient
{
public static final int TIMEOUT = 5000;
- private static final Cache<String, InetAddress> addressCache = CacheBuilder.newBuilder().expireAfterWrite( 1, TimeUnit.MINUTES ).build();
+ // Waterfall Start - use async resolver from Netty
+ //private static final Cache<String, InetAddress> addressCache = CacheBuilder.newBuilder().expireAfterWrite( 1, TimeUnit.MINUTES ).build(); // Waterfall - remove cache
+ private static final io.netty.resolver.dns.DnsAddressResolverGroup dnsResolverGroup =
+ new io.netty.resolver.dns.DnsAddressResolverGroup(PipelineUtils.getDatagramChannel(), io.netty.resolver.dns.DefaultDnsServerAddressStreamProvider.INSTANCE);
+ // Waterfall End
@SuppressWarnings("UnusedAssignment")
public static void get(String url, EventLoop eventLoop, final Callback<String> callback)
@@ -57,19 +61,22 @@ public class HttpClient
}
}
- InetAddress inetHost = addressCache.getIfPresent( uri.getHost() );
- if ( inetHost == null )
- {
- try
- {
- inetHost = InetAddress.getByName( uri.getHost() );
- } catch ( UnknownHostException ex )
- {
- callback.done( null, ex );
- return;
- }
- addressCache.put( uri.getHost(), inetHost );
- }
+ // Waterfall Start: remove IP address cache
+ //InetAddress inetHost = addressCache.getIfPresent( uri.getHost() );
+ //if ( inetHost == null )
+ //{
+ // try
+ // {
+ // inetHost = InetAddress.getByName( uri.getHost() );
+ // } catch ( UnknownHostException ex )
+ // {
+ // callback.done( null, ex );
+ // return;
+ // }
+ // addressCache.put( uri.getHost(), inetHost );
+ //}
+ java.net.InetSocketAddress address = java.net.InetSocketAddress.createUnresolved(uri.getHost(), port);
+ // Waterfall End
ChannelFutureListener future = new ChannelFutureListener()
{
@@ -86,13 +93,13 @@ public class HttpClient
future.channel().writeAndFlush( request );
} else
{
- addressCache.invalidate( uri.getHost() );
+ // addressCache.invalidate( uri.getHost() ); // Waterfall - use async DNS resolver
callback.done( null, future.cause() );
}
}
};
new Bootstrap().channel( PipelineUtils.getChannel() ).group( eventLoop ).handler( new HttpInitializer( callback, ssl, uri.getHost(), port ) ).
- option( ChannelOption.CONNECT_TIMEOUT_MILLIS, TIMEOUT ).remoteAddress( inetHost, port ).connect().addListener( future );
+ option( ChannelOption.CONNECT_TIMEOUT_MILLIS, TIMEOUT ).resolver(dnsResolverGroup).remoteAddress( address ).connect().addListener( future ); // Waterfall - use async DNS resolver
}
}
diff --git a/proxy/src/main/java/net/md_5/bungee/netty/PipelineUtils.java b/proxy/src/main/java/net/md_5/bungee/netty/PipelineUtils.java
index 503adfd..ad47dbb 100644
--- a/proxy/src/main/java/net/md_5/bungee/netty/PipelineUtils.java
+++ b/proxy/src/main/java/net/md_5/bungee/netty/PipelineUtils.java
@@ -111,7 +111,7 @@ public class PipelineUtils
return epoll ? EpollSocketChannel.class : NioSocketChannel.class;
}
- public static Class<? extends Channel> getDatagramChannel()
+ public static Class<? extends io.netty.channel.socket.DatagramChannel> getDatagramChannel() // Waterfall - change to DatagramChannel
{
return epoll ? EpollDatagramChannel.class : NioDatagramChannel.class;
}
--
2.7.4 (Apple Git-66)